Tool for boring piano-action parts.



F. W. HALE.

TOOL FOR BORING PIANO ACTION PARTS.

APPLICATION FILED MAY 10, 1910.

Patented July 14, 1914.

3 SHEETS-SHEET 1.

WITNESSES:

1m; NORRIS PEIERS co., WASHINGTOHHD- c P. W. HALE.

TOOL FOR BORING PIANO ACTION PARTS. APPLICATION FILED MAY 10,1910,

1, 1 03,5079 Patented July 14, 1914,

' 3 SHEETS-SHEET 2.

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YHE NDRRIS PETERS co, wnsmmnou, 11cv F. W. HALE.

TOOL FOR BORING PIANO AOTION PARTS.

APPLICATION FILED MAY 10, 1910. 1,103,507, O Patented July 14, 1914.

3 SHEETSSHEET 3.

THE NORRIS pa es (20., wum'vcmrv, n. c.

nrrnn STATES PATENT onnro.

FRANK W. HALE, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO TUNERS SUPPLY COMPANY, OF SOMERVILLE, MASSACHUSETTS, .A. CORPORATION OF MASSACHUSETTS.

TOOL FOR BORING PIANO-ACTION PARTS.

Specification of Letters Patent.

Application filed May 10, 1910. SerialNo. 560,416.

To all whom it may concern Be it known that I, FRANK W. HALE, of Somerville, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Tools for Boring Piano-Action Parts, of which the following is a specification.

This invention relates to a tool for boring piano action parts.

The object of the invention is to provide a device which is simple and compact, and by means of which holes may be bored in piano action parts, such as hammer heads, butts and the like, to correspond exactly in size and direction to those of the parts which are to be replaced or repaired; and also to produce a device which can be readily held in the hand and manipulated without the necessity of mounting it upon a bench, table or other support.

The device is intended primarily for use by piano tuners and the like, although readily adapted for other purposes.

With the above ends in view, the invention consists in the boring tool hereinafter described and particularly defined in the claims.

In the accompanying drawings, Figure 1 is a side elevation of the device; Fig. 2 is a central, longitudinal, vertical section, with parts in elevation; Fig. 3 is a left hand end elevation; Fig. 1 is a sectional plan view of the device in the position shown in Fig. 1; Fig. 5 is a sectional plan view showing the method of applying the inclination gage for setting a hammer head at the correct angle; Figs. 6 and? are end and side elevations respectively of a hammer head at an angle to its stem, and with the inclination gage applied thereto; Fig. 8 is a side elevation showing a hammer head in position for drilling with respect to angle and to pitch; Fig. 9 is a side elevation of a hammer head showing its angle and pitch, and the application of the inclination gage thereto; and Fig. 10 is a similar view of a hammer head. showing its pitch alone.

As shown in the drawings, the device comprises a base 1, having a drill holder 2 mounted thereon. The drill holder comprises a barrel having a screw threaded bore 4, extending radially with respect to thecenter of the base. A. drill 6 is externally threaded to fit the threads in the bore, and is provided with a handle 8 at one end. Thus by rotating the drill it is self-feeding. pair of concave grooves 7 and 9 are formed on the exterior of the barrel of the drill holder, and extend longitudinally thereof for receiving the inclination gage, as will be hereinafter explained.

The base 1 is provided with an axial hole 10, in which a flanged work holder or carriage 12 is mounted to swivel, and said carriage is secured in adjusted position by a set screw 14;. The work holder'is formed with a central depression, or cavity 16, which'receives the heel of the hammer head, and in Patented July 14, 1914. Y

the'bottom of which a stop or adjusting screw 18, is mounted. The work holder is provided with a pair of upwardly extending standards 20, in which clamping screws 22 are mounted. These clamping screws are provided on their inner ends with swiveled heads or jaws 241, having .V-shaped slots 26 on their inner faces. Pins 28 are carried by the outer ends of the screws 22, by means of which they are rotated.

A face plate or stop 30 extends across the carriage adjacent to the standards 20. The inner face of this plate is at right angles to the axis of the drill, so that any part held against this plate will be drilled at right angles to the face presented to said plate. A V-s'haped groove 31is formed in the inner face of the plate 30 for receiving the corner of the article to be bored.

Projecting upward from the carriage is a screw threaded rod 32, having a threaded arm 34 near its upper end, which forms a length gage, adjustable along the rod 32 and secured in adjusted position by a lock nut 36. Below the length gage 3 1, is a similar threaded arm 38, having notches 4:0, and held in position by a lock nut 42. This arm forms a sight gage by which the successive hammer heads can be set in the work holder at the proper inclination.

The use of the device will be explained in connection with hammer heads, although it should be understood that it is also adapted for use in drilling butts, and other action parts.

When it is desired to replace a hammer head it is essential that the new head shall have the same position on its stem that the string correctly. This is accomplished by drilling the stem hole in the new head in exheads.

' inclination gage.

actly the same location as in the old head, as regards direction and distance from the striking surface.

To rebore a hammer head which is at right angles to the stem, it is placed in the carriage with the center of the hole in line with the center of the drill, and -with the face of the shank or heel of the hammer head against the face plate 30, as shown in Fig. 2. The adjusting or stop screw 18 may be screwed up against thelower end of the hammer head to" aid in centering the head preparatory to clamping it in position. Then the head is clamped in position by the jaws 2 1, as shown in Fig. 3. If a number of heads are to be thus bored, the length gage 34 is used. This is brought against the upper or striking face of the hammer, as shown in Fig. 2, after the first head has been bored, and secured in position by the nut 36;" All subsequent heads are placed in the carriage with their striking surfaces against this gage. Thus thedistancebetween this surface and the stem hole is the same in all of the When the head to be repaired, replaced or duplicated is tilted upon its stem, either laterally, called the angle, or longitudinally, called the pitch or both, it is necessary'to measure the old head, or the one adjacent thereto, by means of an This gage comprises a body' portion 50, having a concave inner surface adapted to fit the stem 51 of the hammer, and an outer convex surface adapted to fit the grooves 7 and 9 onthe barrel of the drill holder. A. head 52 is pivotally mounted upon one end of the body portion, and is adapted to be tilted to fit the inclination of'the heel of the hammer head, while the body portion is held against the stem, as shown in Figs. 5,7, 9 and 10. I

To drill a head as shown in Figs. 6 and 7, the new head is clamped between the jaws with the under face 5 1 of the heel of the hammer against the face plate 30. The inclination gage 50 is then placed with its concave face against the stein 51, and slid up until its head 52 fits against the face 56 The inclination gage is then placed with its convex surface inthegroove 7, and the carrier is swung around until the surface of the hammer heel corresponds to the edge of the gage head 52. The carriage isthen clamped in this position, and the hole is bored.

To drill a head such as is shown in Fig. 9,

' the inclination gage 50 is placed against the stem 51, and pushed upagainst the hammer head until the upper edge of the gage head 52 is inclined at the same angle as ,the under surface of the hammer head. The new head is then clamped between the'jaws 2 1, and the inclinatlon gage is placed in the groove 7.

The carriage is then turned until the face of the hammer heel is. inclined tocorrespond to the edge of the gage head, and then clamped. As the hammer head in this figure must also be set with regard to pitch, the inclination gage is again placed upon the stem and the gage head adjusted accordto the pitch of the hammer head. Then the gage is placed in the groove 9, and

the hammer head is tilted longitudinally in the clamp ofthe carriage until it corresponds to the gage, as shown in Fig. 8. The jaws 2a are then set tightly and the hole bored.

If a number of heads are to be bored at the same inclination, the sight gage 38 is swung against the head, beforelthe latter is removed from the carriage, and anote made ofthe notch which is nearest to the center line of the head, then the subsequent hammers are positioned in the carriage accordingly to correspond. To drill a head such as is shown'in Fig. 10, it is merely necessary to measure the pitch as explained above. The head is clamped lightly between the jaws, the can riage being in the position shown in Fig. 1, and then the head is tilted to fit the inclination gage, as explained above, clamped tightly and drilled. hen the direction of the stem hole is such that it cannot be drilled with the head held by the faces of the jaws 2a, the heel of the hammer head is held in the notches 26. Thus holes may be bored at any point on. the periphery of the hammer shank or'heel.

W hilel: have illustrated and described a preferred embodiment of the invention, 1 am aware that many modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore I- do not wish to be limited to all the details of construction shown and described, but

What I claim is 1. In a deviceof theclass combination of a base, a work holder mounted to rotate centrally of said base about a vertical axis, adrill-holder on said base having a drill movable horizontally and radially with respect to the axis of rotation of said work holder, and a pair of standards on said work holder on opposite sides of said vertical axis, each carrying aclamping screw provided with a swiveled head.

J 2. In a'device of the class described,'the combination of a base,,a work-holder mounted to rotateon said base, a face plate on the work holder parallel to the axis of the latter, a drill-holder on said base having a drill movable radially with respect to the axis of rotation of the work-holder, said 'drill beingrotatable relatively to said work'- h'older in a plane perpendicular to the plane described, the

of said face plate, and a pair of clamping screws on said work-holder on opposite sides of the axis.

8. In a device of the class described, the combination of a base, a flanged work holder rotataibly mounted in said base and having a cavity formed therein for receiving the heel of a piano hammer, an adjusting screw projecting through the bottom of said cavity, standards on said base, a pair of clamping screws carried by said standards and provided with swiveled jaws, and a drill holder integral with said base and having a bore extending radially and perpendicularly with respect to the axis of rotation of said work holder.

4:. In a device of the class described, the combination of a base, a carriage mounted to swivel thereon, a drill-holder on the base provided with a longitudinal groove on its exterior, a gage having a body portion shaped to fit said groove and a positively fed drill in said drill holder.

5. In a device of the class described, the combination of a base, a carriage mounted to swivel thereon, a drill-holder on the base provided with a longitudinal groove on its exterior, a gage having a body portion shaped to fit said groove, a drill mounted to rotate in said drill-holder, a rod, and an adjustable arm on the rod for determining the distance of the striking face of a hammer head from the center of the drill.

6. In a device of the class described, the combination of a base, a work holder rotatably mounted on said base, clamping means on said work holder provided with swiveled jaws, a drilling device on said base, a length gage for maintaining the correct distance between the striking face of a hammer head and the center of the drill, a sight gage for determining the inclination of the hammer head, and means for securing the work holder in adjusted position.

7 In a device of the class described, the combination of a base, a carriage mounted to swivel thereon and having a central depression, a drill holder on the base, an adjusting screw carried by the carriage and projecting into said depression, and means for clamping the carriage in adjusted position.

8. In a device of the class described, the combination of a base, a flanged work holder mounted to rotate on said base about a vertical axis and having a depression formed therein for receiving the butt of a hammer head, a drill holder comprising a barrel integral with said base and extending laterally therefrom, a pair of clamping members carried by the work holder and. located on opposite sides of said depression, and a drill movable in said holder radially with respect to the axis of rotation of said work holder.

9. A device of the class described comprising a boring attachment having external grooves thereon, and a carriage rotatable relatively to said boring device, in combina tion with a gage having a body portion shaped to fit said grooves, and a head swiveled upon said body portion.

10. A device of the class described, comprising a boring attachment having external grooves thereon, and a carriage rotatable relatively to said boring attachment, in combination with a gage having a body portion shaped on one side to fit said grooves and on the opposite side to fit the article to be measured, and a head swiveled upon said body portion.

11. A device of the class described, comprising a boring attachment having external grooves thereon, a work holder rotatable relatively to said boring attachment and provided with swiveled clamping means, in combination with a gage having a body portion shaped to fit said grooves, and having means for determining the position of the work in the work holder.

In testimony whereof I have afiixed my signature, in presence of two witnesses.

FRANK W. HALE.

Witnesses H. A. Jones, WM. PAULSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

